Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590d354d9faff20…

MALICIOUS

PDF

78.4 KB Created: 2021-06-28 03:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e3a0f0d4104f8636b082c7a06aa7572 SHA-1: 3b94d137fb1f0fe6e7fb626e826385c4c259845b SHA-256: 5590d354d9faff201f8819527963b35547f0d9b998b6737733f76971a83c61fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it's intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=find+parametric+equation+of+tangent+line+at+point
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bb1707837461be95fe9cb367da046f1a/61629489580.pdf
    • https://vyrukrc.lt/userfiles/file/58989565001.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/80pv4sc3gr1kpsotbn9b3vb62j/26716692172.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kiwumebunipasaf.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/daf76ab9e226c4263e4542a7814057a4/vesaladaru.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1712152253a0d4bafdb7c2ab45f31e9a/955420023.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7ad98d5f2df14f1bc6030de0a51914e0/87081129397.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4291dc479058f438e85007a3cbc0decb/ligabaturavurofuxarunite.pdf
    • http://brandnewgoods.net/userfiles/file/sedujap.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/gumetotevivovosewuk.pdf
    • http://orchid-daikanyama.com/userfiles/file/zegenulaxenelata.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/99504960871.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1919eabd---bupoxitetok.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ed13cc4ce4b2dac12946fd7c931f1978/sediguzidewiserutorapexap.pdf
    • http://ahkjt.com/upfile/file/bisoduzubit.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773be36b513---kudazevevugisosobel.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04aee5fef---5291411892.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oqp94q8d5fej5qs6d8uj3l4o8d/47578067692.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3b193c521b9f222e8bbab6f2e41cb9df/kemusep.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744fdaf1b03---26545307815.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785917c20e8---tizusurinub.pdf
    • https://chp-travel.ir/data/file/masomirubibozexivora.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4338201927---bafekemilajutezomu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf78.bin
61c7e5f9f222d08f30f7049740e33a3c30ce22ae3fda5d8e89e84b251e8ab1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 11016 bytes
font_01_sfnt_off0000e87b.bin
b8f98a29bf50763008a5269d8b96f6eeb251315f4b5c83d99d6f2ab9f8dca97a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 16520 bytes
font_02_sfnt_off000113bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 16792 bytes